3Com 5012 Installation Guide - Page 58

58 CHAPTER 6: ROUTER MAINTENANCE Opening the Chassis Follow these steps to open the chassis cover: Cover 1 Turn off the power switch of the router and remove the power cord. 2 Remove all interface cables from the rear panel. When doing this, note to retain the grounding wire. 3 Place the router on a flat surface, with its rear panel forward. Use the Phillips screwdriver to remove the four fastening screws from the rear panel. 4 Raise the chassis cover until its front edge is separated from the chassis bottom completely. 5 Pull the chassis cover towards you until the tab on the back edge is disengaged from the front panel, and put away the cover. Figure 40 Open the chassis cover 1) Chassis cover 3) Fastening screw 2) Chassis bottom CAUTION: ■ On a mounting screw of your router chassis, there is an anti-dismantle seal of 3Com Corporation. You must keep it in good condition when asking your sales agent for servicing. You can open the chassis yourself but with permission of your sales agent and must operate following the related rules. The company is not liable for any damage or consequence resulted from users' operation without permission. ■ Do not replace the hardware unless necessary and under the guidance of technical staff. ■ Ensure that no electricity is present before servicing the device to avoid bodily injuries and device damage. ■ Wear an ESD-preventive wrist strap when servicing the device, making sure it has good skin-contact. ■ Use the SDRAMs provided by 3Com Corporation only. Otherwise, anomalies might occur to the device. Replacing the SDRAM The storage media available with the router include: ■ SDRAM: where the host program is running. ■ Flash memory: stores the application and configuration files. ■ Boot ROM: stores the Boot ROM program.